Worth



no Model.) H W. WORTH- MAGNETIC EXTRAOTOR. No. 468,706. Patented Feb. 9, 1892 W/TNESSES //v VEN 70H Tin: xonms ravens 20., munnrma, \wsumurou, n, c.

UNITED STATES PATENT OFFICE.

HORATIO 1V. SOUTIHVORTH, OF NEW" YORK, N. Y.

MAG N ETIC EXTRACTO R.

I SPECIFICATION forming part of Letters Patent No. 468,706, dated February 9, 1892.

7 Application filed March 11, 1891. $erial No. 384,545. (No model.)

To all whom it may concern.-

Be it known that I, I-Ionnrro W. SOUTH- WORTH, of New York city, in the county and State of New York, have invented a new and Improved Magnetic Extractor, of which the following is a specification, reference being had to the annexed drawings, forming a part thereof, in which Figure 1 is a plan View, partly in section, of my improved magnetic extractor; and Fig. 2 is a side elevation partly in section.

Similar letters of reference indicate corresponding parts in both views.

1 In the manufacture of paper it frequently happens that pieces of iron and steel find their way into the paper-pulp and not only damage the machinery used in paper manufacture, but also injure the product.

The object of my invention is to provide simple and efficient apparatus for removing the particles of iron and steel from the pulp.

My invention consists in the combination, with a helical channel or sluice, of a series of magnets arranged with reference to the channel so that'the pulp in flowing by its own gravity through the apparatus will be brought into contact with the magnets, so that the magnets may take up any particles of steel or iron contained by the pulp and hold them until the end of the run, when the apparatus is cleared of the pulp and the magnets are discharged of the adhering particles of magnetic material.

In carrying out my invention I form a helical sluice A of approximately semi-oval crosssection, the outer edge of the channel-being curved over inwardly. Along the upper edge of the outer wall of the channel are arranged electro-magnets B, having polar extensions 0 placed against the inner surface of the outer wall of the channel, so that the pulp in flowing through the channel as it acquires momentum is thrown outwardly by centrifugal force and made to rotate in contact with the enter wall of the channel and the polar extensions of the magnets, thus bringing every portion of the pulp into contact with the poles of the magnets, in its passage downwardly through the channel A. In the upper portion of the channel A the electro-magnets are omitted and the inner surface of the channel is left smooth to allow the pulp to acquire a certain velocity before being brought into contact with the polar extensions of the magnets.

To reduce the resistance of the magnet poles, they are made of approximately semielliptical section, as shown in Fig. 1. This form also is favorable to the rolling motion of the pulp passing through the channel.

The magnets B are supplied with a suitable current from any source of electricity. At the end of the run, which may continue for a day, or more.or less, the flow of the pulp is stopped, the channel A is washed with Water, the current through the magnet-coi1s Bis discontinued, and the particles of iron taken by the magnets from the pulp are washed away. To avoid corrosion, the polar extensions of the magnets may be galvanized with zinc or nickel-plated.

Although I have described my apparatus as being adapted to extracting iron from paperpulp, I do not limit or confine myself to this use, as it may be employed in various industries in separating magnetic from nonmagnetic materials.

It is obvious that permanent magnets may be used in lieu of electro-magnets. Therefore I do not confine myself to the exact construction herein shown and described.

By arranging the coils of the electro-magnets above thelevel of the material contained by the channel moistening of the helices and consequent leakage of the current are avoided.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a magnetic extractor, the combination, with a helical channel, of a series of magnets having poles projecting into the channel, substantially as specified.

2. The combination, with a helical sluice or channel, of a series of electro-magnets having polar extensions of semi-elliptical section projecting into the sluice or channel, substantially as specified.

3. In a magnetic extractor, a helical sluice or channel with the upper portion constructed plain without magnets and the remaining portion furnished with a series of magnets projecting into the sluice or channel and in mitting the pulp to the action of magnets, as contact with the contents thereof, substanspecified.

tially as specified. 1

4:. The method of separating magnetic ma HORATIO SOUI HWORCLH 5 terial from paper-pulp, which consists in im- Witnesses:

parting to the paper-pulp a combined helical E. M. CLARK, and rolling motion and simultaneously sub- 0. SEDGWIOK. 

